poston



Feb. 7, 1928. R 16,876

' L. L. POSTON ARTIFICIAL TOOTH original Filed April 28. 1917 ReissuedFeb. 7, 1928.

A, UNITED STATES PATENT OFFICE. I

LEON L. POSTON, or ron'r MYERS, nonma, Assroiron To run commas Damn.mmmc'runnm co., or COLUMBUS, onro, A CORPORATION or 01110.

ARTIFICIAL 'roo'rrr.

original m. 1,338,959, dated may 4, 1920, Serial no. 1 5,135, filed A rn2a 1917.

relstue filed April 27, 1927. Serial No. 187,085.

M invention relates to improvements in artificial teeth in which areplaceable tooth facing and base is used in connection with ametalbaeking with a biting surface; and the ob acts of my improvementare:

let. 0 provide a suitable backing having a. biting edge or surfaceadapted to be in serted in the proper bridge work and a porcelain facinghaving a full base whichcan be I!) removed or slipped off from thebacking.

2nd. To provlde such a backing and biting surface that will be strongand to which the facing and base of porcelain can be fitted and attachedafter the bridge is in place. 3rd. To rovide a porcelain tooth that canbe replaced 'upon a bridge without removing the brid e.

4th. 0 provide such an artificial. tooth that the porcelain facing andbase can be removed or attached without altering the biting surface.

5th. To provide such a porcelain tooth that the base of orcelain comesin contact with the gum of t e mouth and not the metal and yet iovidinga metal biting edge or incisal sur ace. 6th.- To provide such a surfaceand backthat the said backing may be constructed separately casting thebacking or by runsolder on a thin plate that has been fitted to theentering surfaces without heati the porcelain.

, lustrated in the accompanying drawing, in

' as hi Fi .ure 1 isa erspective view of the porcelain t and base; Fig.2is a perspective view of t e metal backing; Fig. 3 is a per- 3 activeview of the orcelain tooth with t e backing in place; Fig. 4 is avertical cross section of the porcelain facing; Fig. 5 is a verticalcross section of the backing; Fig. 6 is a side elevation of a finishedtooth ofthe bicuspid or molar type.

Similar letters refer to similar parts throughout the several views:

A porcelain tooth d of any proper shape is employed having a full basez. This porcelain tooth d is cutaway by entering surfaces as a, b from apoint at a suitable distance above what would be they incisal edgeorcutting surface of the tooth and ex tending out to a oint below thefinished base to the tooth. nto this porcelain facing I socket a.

attain these objects by the structureiL' contour of the down against it.

ama mhaving the base 2' is a socket c, which socket is made of uniformcross section and is preferably circular though it may take a square ortriangular form, depending upon the desired shape of the pin 9 hereafterreferred to.

A suitablemetal tooth backing h is employed having outwardly extendingsurfaces 6 and These surfaces are adapted to fit to the surfaces in theporcelain tooth as a, 5, preferably the surfaces a, 6 form anobtu'seplain angle. When the surfaces on 1 the porcelain tooth form an obtuseentrant plain angle as a and b, a corresponding lainangle is formed onthe backing h by t e surfaces 6 and f respectively. At the outermostprojection of the surfaces e and f a suitable pin 9 is extended whichmay be of the same metal as the backing h but which referably maybecast, Welded or soldered into the backing h and made'of a less expensiveor suitable metal. The socket c is so placed with respect to thesurfacesa, b or a,- b' as to receive the pin g when the surfacese and[respectively are in contact with the'said surfaces at, b respectively.The pin 9 may be, depending upon the character of 'the socket c, of anysuitable cross section but is preferably used in the round form. The pin9- is adapted to be cemented into the The base a of the porcelain fac Iingd is madefull and of such suitable shape that it maybe ground awayand fitted'and may take the form as indicatedat z to fit the The fullbase 2 of the facing dis extended over the backing It so that the gums:of the.

mouth never come in contact with "the backing it and the facing d is socut away that the backing h always forms the incisal or biting edge ofthe tooth.

In the development of h is adapted to be attached and fused or sol-;

dered into bridge workand is so constructed that no portion of it evercomes incontact.

gums of the mouth coming the art of dentistry a backing adapted to besoldered into the bridge in connection with other teeth has with thegums and that it receives the biting .uitc anmcisal or blting-sur ace.By'forma den ojf said suffices-1 find that a porcelain 1 j sutjaces eand f respectively and'the sdcket P h pi eee b s d y P' p y e sfihe e"fthe' at proper distance and cemented securely to rthe backing 11 formploymw iii-the at htn -engle diheiecrrespondmg sariaces a} and bspectivel celain at we c t 'mev 0 any exthepflrcelain facingd OPEN "awax backing {formed upon 1 the pol celain facing. dtoithashapeof-thedesizedmetal i ewmpet m w t th {in ermeybe. ,aced ez'wethsn a qdan attached to the *1 Without reinov' ads ed ts jbe efi edto in suit- I dig: surfaces onthe back ing it use g ilg I k i A .s gisem a having surfaces aand 6 media the the ertificiel tontawith a, fullbase pro-ifaces outwardtlg adapted to fit ieg the-metal backing from theand kafiiug e metaltineisal a e,

ll; afiijilnd the -pin you h bwkmg ands-the socket, 0 enables the por-V. acedwupeathe backs hee ngk l uc easelwfie the r u e d andemsis qs msuitable metalmay,

r ot-the said recess with an inclined socket exyz i irenjoyed and mpldedmd a metalof the said facin end 'an-"inc li ned y extending upyveifd y,and foi'wardly able bri ges o1 frames in the inouth, but

projecting surfaces 1n said porcelain facing 55' I extendin fnoxn abovethe biting edge to a point beovdthebase; asocket' of uniform crosssection extending into said facing; a metal'backing having a bitingsurface; surformed on said backing e inwardly iformed su'rfaccs en saidreplaceable facing, and a pin extending from neat the outermost qrtion'off said putwardly extending surfaces on said metal hacking and a'da ted to' enter said socket in said replaceable aci 2. 'An artificial 1035iincluding a rqfiace- V I I able Porcelain facing, having a full baseextending frpm the front to the rear face of" the iacin'g; and. providedwith an anglnlar necess having a front wall and a top we extending.upwardl and rcarwardly, said front and top. e s of the recess ringed atan obtuse angle to each otherjand the said facing'being provided at theangle [tending ug'iwardly, and forwardly atjan inclinaticns andari'angedat an obtuse angle to l to receive the entire strain cfmastication,

saidfl metallic beckig "having an inclined front and top face ati angedat an-obtuse angle to each other Tand'fittmg thewalls of'the' themetallic, backing" at the; angle.

l-l feifmedhyithe eaweed faces thereof J and ar a g ashram obtuse e efldb t the 3ame,'sampin fit'tiiigintheso cket; r; the 90;. 1min;fendpermitting the' saidjfiicin'gtc be iplabiix eairqm idr ni theninjwhe i discurbing'fhs bridge"orCotherinountinginj; themetallic backingmayheai'rangeff hat I claim and desire to secure by Letters

